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Basis prebens; Jaspis virensTwo-voice anonymous hymn SourcesIvrea: Biblioteca Capitolare 115, fol. 39v-40 (2/2).Literature1. HARRISON, Frank Ll. 'Ars nova in England: a new source', Musica Disciplina, XXI (1967), pp. 82-83.2. LEFFERTS, Peter M. The Motet in England in the Fourteenth Century, Ann Arbor: UMI Research Press, 1986, pp. 234-235.    | 
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